VFD Cable and 2.2kw spindle wiring

[Flamered]

I thought the same until I got a shock off it. It's not good practice to rely on bearings to transmit the fault current to earth so I would always advise using 4-core cable to include an earth connection just by the spindle. The cost it's negligible - just one tapped hole in the Z-axis plate to screw the wire on to and you're done. It also adds a bit of redundancy to the system.

Thanks for the help!

I need a little clarification on some of your instructions. I have no clue about electrics apart from wiring up a plug!!

- earth connection just by the spindle -
Do you mean attaching the earth to the z-axis? Only mine is made of MDF, although it has a strip of angle iron which holds part of the carriage. Would it need to be attached to the angle iron.

-just one tapped hole in the Z-axis plate to screw the wire on to -
So the cable attaches to the spindle! How do i get the wire to do this, do i need to leave the earth out of the plug that attaches to the spindle.

Do you have any pictures that would make things 100% crystal clear for someone like me.

Appreciate your help, as its taken me 4 months to get to this point. Its all moving just need to work out the homing and start making splinters

Cheers
Stephen (Bristol)

[JAZZCNC]

Thanks for the help!

I need a little clarification on some of your instructions. I have no clue about electrics apart from wiring up a plug!!

Please don't think I'm scare mongering here but I suggest you seek help from some one who does other wise you have large potential to get this wrong.!

Apart from the obvious danger to yourself from burning the house down if you completely get it wrong.!! . . .It's very possible you can damage the spindle or VFD if not correctly wired or careful attention to detail with wire connections.

Like my previous post says if you feel compelled to have an earth wire then in your case just take a wire from the spindle clamp bolt or any place that makes contact with the spindle body. Then take this wire back to the main Star Earth point in your control box.